Francis Edgar Stanley

) were American inventors, twin brothers, and the most famous manufacturers of steam-driven automobiles.

The Stanley brothers in the United States, however, continued to manufacture steam automobiles until the early 1920s.

…since the era of the Stanley brothers—one of whose “steamers” took the world speed record at 127.66 miles (205.45 km) per hour in 1906. The car designed by them and sold as the Locomobile became the first commercially successful American-made automobile (about 1,000 were built in 1900). It is estimated…